What is this un-used plug??

[Illestreker]

Today I was messing with my fog lights because they were loose and rattling and I looked up and noticed a plug that was not connected to anything. I couldn't trace it back to anything because it was inter-connected to other wires and all where's were very long.

It was on the driver side, somewhat above the fog light are but higher up.

Attached is a picture.

 

[slowpoke99]

hey i found the same thing on mine when i removed my bumper before starting my sas!!! i didn't think much of it cuz i figured that my runner is a '99sr5 and maybe there was something optional that plugged into it. i also found another plug that was wrapped up with the plug going to my marker lights in the front bumper. no clue!!!

 

[GhostRing]

Surf side marker lights?
Surf power parking mirror?
Dunno.

 

[Slow_T4R]

I have the same thing on my 99 and have wondered the same thing. Would be cool if someone knew what it's for.

 

[GottaBeTRD]

i think I posted something like this once and found out what it was, but now I forgot and cant find the post

 

[Illestreker]

^think harder. Haha

 

[NateMob]

I think it's for the outside temperature probe that the digital HVAC controls are capable of showing.

 

[20034RunnerV84x2]

Does yours have a factory alarm? If not that might be the plug for the speaker.... I dunno.

 

[BlackCat914]

Does yours have a factory alarm? If not that might be the plug for the speaker.... I dunno.

the factory speaker is the horn.

 

[shootmymime]

I think it's for the outside temperature probe that the digital HVAC controls are capable of showing.

That's what I was thinking. Mine sits up in front of the ac condenser. Ill look and see if the plug is the same

 

[Socco]

I think it's for the outside temperature probe that the digital HVAC controls are capable of showing.

Yep. If you had digital HVAC controls, this plug would be connected to a sensor to show your outdoor temp.

 

[TheDurk]

Officially it is connector A26--A/C Ambient Temp Sensor shown on the first page of attached.

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/ewdtmc2/ewdtmpdf/ewdsourc/2002/024runne/electric/parts.pdf

The pin out diagram is on here at A26 (left one is #1 and the other is #2, Yippeee!)

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/ewdtmc2/ewdtmpdf/ewdsourc/2002/024runne/connecto/connecto.pdf

I just did this because I thought some peeps might be interested in how you can use the wiring manual.

 

[paddlenbike]

Hmm, I was planning to install an outside temperature sensor and the electrical diagram got me to thinking. Rather than running new wiring outside of the cab I'm guessing the other end of that temperature loom must terminate in the HVAC area, making installation of outside temperature easier. Might have to investigate this further.

 

[Brian757]

I'm not quite sure of this, but was Toyota known for leaving unused plugs around the "not-so-fortunate" versions of vehicles? (Base/SR5)(SR5/Limited)

I would imagine an SR5 would be wired differently than a Limited, and that the factory wouldn't include the wiring in the stripped down versions.

EDIT: I guess so..

 

[paddlenbike]

If one end of the harness exists there has to be a termination somewhere. My SR5 was pre-wired for fog lights, so some level of pre-wiring exists.

 

[g_luck]

I'm not quite sure of this, but was Toyota known for leaving unused plugs around the "not-so-fortunate" versions of vehicles? (Base/SR5)(SR5/Limited)

I would imagine an SR5 would be wired differently than a Limited, and that the factory wouldn't include the wiring in the stripped down versions.

EDIT: I guess so..

Almost all car companies do this because its cheaper in the long run than having two or more assembly lines set up or end up with the wrong wiring in a vehicle.

Toyota goes so far as to have the Yaris built with a center speedometer cluster so they can use just one dash and switch sides of the steering wheel depending on what country it goes to.

 

[Brian757]

Almost all car companies do this because its cheaper in the long run than having two or more assembly lines set up or end up with the wrong wiring in a vehicle.

Toyota goes so far as to have the Yaris built with a center speedometer cluster so they can use just one dash and switch sides of the steering wheel depending on what country it goes to.

Yeah, I figured it was for financial reasons. That's crazy about the Yaris as well! I know the Mini Coopers have the speedo in the middle, correct?
Maybe for the same reason..

 

[TheDurk]

Hmm, I was planning to install an outside temperature sensor and the electrical diagram got me to thinking. Rather than running new wiring outside of the cab I'm guessing the other end of that temperature loom must terminate in the HVAC area, making installation of outside temperature easier. Might have to investigate this further.

OK, I can tell you this much. A26 has a black/blue wire and a gray. The gray is a common wire from the A/C circuit, probably a ground, that goes to several sensors, so you can't use that one.

The black/blue (B/L) is interesting. On the digital models, it terminates on plug A30 on the A/C amplifier in the center of the dash. That plug does not exist in the manual A/C and I don't think it's just unused in the dash, but I could be wrong. It's pretty big, and I think I would have noticed it on mine. And there is no B/L wire in the manual A/C.

That B/L wire passes through Connector IG1 at Pin 19 in the left kick panel. You can see that pinout on the link in my post above. My guess is that wire dies there, leaving Pin 19 blank on the mating side, and then Toyota used a different harness from there to the center dash when it built the digitals as opposed to manuals. Here are those circuit diagrams:

Manual:http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/ewdtmc2/ewdtmpdf/ewdsourc/2002/024runne/systemci/057acman.pdf

Auto/digital:http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/ewdtmc2/ewdtmpdf/ewdsourc/2002/024runne/systemci/056aac.pdf

This all assumes nothing changed between your year and the 2002 Wiring Manual I have available to me. In any case, an unused wire from the left bumper to the left kick panel for those of us with manual A/C could have multiple uses. Please post whatever you find, if you get around to it.

If anyone wants the link to the on-line Repair and Wiring Manuals, here it is, courtesy of our Taco brethren. This is the only one I know of still operating.

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/contents.htm

 

[20034RunnerV84x2]

I'm not quite sure of this, but was Toyota known for leaving unused plugs around the "not-so-fortunate" versions of vehicles? (Base/SR5)(SR5/Limited)

I would imagine an SR5 would be wired differently than a Limited, and that the factory wouldn't include the wiring in the stripped down versions.

EDIT: I guess so..

They do this to make production more cost effective. If they make a wiring harness for each and every vehicle it would cost more. Making one and tucking the unused wires and connectors away is more cost affective and it makes it possible for the port to install crap you'll eventually rip out.


Sent from my iPhone using Tapatalk 2

 

[Boiseflyfisher]

OK, I can tell you this much. A26 has a black/blue wire and a gray. The gray is a common wire from the A/C circuit, probably a ground, that goes to several sensors, so you can't use that one.

The black/blue (B/L) is interesting. On the digital models, it terminates on plug A30 on the A/C amplifier in the center of the dash. That plug does not exist in the manual A/C and I don't think it's just unused in the dash, but I could be wrong. It's pretty big, and I think I would have noticed it on mine. And there is no B/L wire in the manual A/C.

That B/L wire passes through Connector IG1 at Pin 19 in the left kick panel. You can see that pinout on the link in my post above. My guess is that wire dies there, leaving Pin 19 blank on the mating side, and then Toyota used a different harness from there to the center dash when it built the digitals as opposed to manuals. Here are those circuit diagrams:

Manual:http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/ewdtmc2/ewdtmpdf/ewdsourc/2002/024runne/systemci/057acman.pdf

Auto/digital:http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/ewdtmc2/ewdtmpdf/ewdsourc/2002/024runne/systemci/056aac.pdf

This all assumes nothing changed between your year and the 2002 Wiring Manual I have available to me. In any case, an unused wire from the left bumper to the left kick panel for those of us with manual A/C could have multiple uses. Please post whatever you find, if you get around to it.

If anyone wants the link to the on-line Repair and Wiring Manuals, here it is, courtesy of our Taco brethren. This is the only one I know of still operating.

1996 to 2002 Toyota 4Runner OEM Repair and Wiring Manuals

Yep, saw the same open plug on my '02 SE with manual A/C & thought I could use it to install a used GM outside temp sensor and its rear view mirror with digital compass and temp display from a GM truck, but no luck. This OEM plug is not compatible with GM sensor. I even tried a Toyota OEM sensor with the GM mirror but mirror was not compatible with Toyota sensor. I found exactly what you provided after reviewing wiring diagrams for both manual and auto A/C.
Had to run the GM temp sensor wiring from that location where OEM plug is through driver side engine bay (with wire loom) and firewall, then up driver side A pillar and headliner over to mirror. There's a pretty good write up on it if you search "auto dimming mirror" I think.